A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
Separate names with a comma.
You might be able to set it in script to the optimal settings. I have the exact same problem with IOS where there's slowness in playing the sound...
You could try this http://prof.johnpile.com/2015/11/02/unity-scaling-particles/
When would the resolution change on a mobile device?
By the Spring position offset, you're referring to the ConnectedAnchor changing as a result of the springs, right?